As the error was performed via the god Indra, he grants Hanuman a want that his body will be as solid as Indra's Vajra, and that his Vajra may not harm him. As well as Indra other gods have also granted him needs: the God Agni granted Hanuman a wish https://shanidevmandirinsouthaustralia.blogspot.com/2024/06/discover-hanuman-mandir-spiritual-oasis.html